CN108824636B - Anti-seismic and fireproof prestress assembly type concrete node - Google Patents
Anti-seismic and fireproof prestress assembly type concrete node Download PDFInfo
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- CN108824636B CN108824636B CN201810601789.4A CN201810601789A CN108824636B CN 108824636 B CN108824636 B CN 108824636B CN 201810601789 A CN201810601789 A CN 201810601789A CN 108824636 B CN108824636 B CN 108824636B
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- concrete
- earthquake
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- prestressed
- fire
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
- E04B1/21—Connections specially adapted therefor
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
Abstract
The invention relates to an earthquake-resistant and fire-resistant prestressed fabricated concrete node which comprises a concrete beam with a pre-embedded steel plate and a concrete column, wherein the concrete beam is connected with a base plate on the concrete column through the base plate, a hole is reserved in the middle of the concrete beam, and a prestressed rib penetrates through the hole. Compared with the prior art, the earthquake-proof fire-resistant wall body can reduce earthquake damage, can resist earthquake secondary fire, has good self-recovery capability during earthquake, and has good fire resistance under the earthquake secondary fire, thereby reducing the loss of lives and properties to a certain extent.
Description
Technical Field
The invention relates to the field of buildings, in particular to an earthquake-resistant and fire-resistant prestressed fabricated concrete node.
Background
Earthquake secondary fire is one of the main secondary disasters of earthquake. In cities suffering from earth quake damage in the world, there are earthquake and fire phenomena caused by various reasons such as house collapse and pipeline breakage. In many of the cities, the losses from earthquake fires far exceed those from earthquakes themselves, such as 58 in the old san francisco earthquake in 1960, 109 in the saint fisher south earthquake in 1971, 67 in the lomaprilata earthquake in 1989, and 87 in the northern greens earthquake in 1994. The most notable is the great earthquake of kanto in japan in 1923, 10 million people died of 14 thousands of casualties from fire, and the burned houses account for over 2/3 of the total destroyed houses, causing huge loss. Therefore, earthquake and earthquake fire cause social damage greatly, and the development progress of human society is restricted. Under the wave of building industrialization, recoverable functional structures capable of reducing earthquake damage are produced at the same time, and the design of recoverable nodes is important.
The existing node design method aiming at reducing earthquake damage mainly comprises a self-resetting prestress prefabricated assembly concrete frame node (PTED node) and a PEC column-steel beam BRS energy consumption self-resetting node based on top and bottom angle steel energy consumption. However, these two methods can only resist the action of earthquake, and are difficult to resist the action of earthquake secondary fire: in the former method, the prestressed tendons in the pore channels are in direct contact with a high-temperature environment, the temperature can reach nearly 400 ℃, and serious prestress loss and serious potential safety hazard are caused due to high-temperature creep of the prestressed tendons and concrete; in the latter method, not only is the amount of steel used significantly increased, but also a large area of the steel beam is exposed to a fire, increasing the risk of the structure losing its load bearing capacity on fire, resulting in an overall collapse of the structure.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a recoverable assembly type concrete node which can reduce earthquake damage and resist earthquake secondary fire.
The purpose of the invention can be realized by the following technical scheme:
an earthquake-resistant and fire-resistant prestressed fabricated concrete node comprises a concrete beam with a pre-embedded steel plate and a concrete column,
the concrete beam is connected with the backing plate on the concrete column through the backing plate,
a hole is reserved in the middle of the concrete beam, and a prestressed tendon penetrates through the hole.
The prestressed tendon consists of a steel strand and a prestressed shape memory alloy tendon (SMA tendon), the steel strand and the SMA tendon work cooperatively at low temperature, and the shape memory effect of the SMA tendon is excited at high temperature to cause the SMA tendon to generate reverse martensite phase transformation and generate pretightening force, so that the prestress loss of the steel strand is compensated.
And an anchorage device is arranged at the joint of the prestressed tendon far away from the concrete beam and the concrete column for anchoring.
The two concrete beams are mutually crossed and lapped on the bracket of the concrete column.
The joint of the concrete beam and the concrete column is also provided with angle steel, and semi-rigid nodes of the angle steel are arranged at the joints of the concrete beam and the column so as to properly relax the restraint between the beam and the column and allow the rotation of the frame beam. In the node allowing the frame beam to rotate, the structure can freely swing under the action of earthquake, and the beam and the column member participate in energy consumption. In addition, the steel plates can prevent the concrete from being locally damaged during collision and facilitate the construction of bolt connection. On the basis of arranging the angle steel, the self-resetting of the structure can be realized by arranging the non-cohesive steel-SMA combined prestressed tendon in the beam. SMA has a unique shape memory effect, and SMA transforms from the martensite phase to the austenite phase at high temperatures and reverts to the original form. If the traditional prestressed steel strand is combined with the SMA bar, the two ends of the traditional prestressed steel strand are prestressed. At high temperatures the SMA will develop considerable restoring forces which counteract the loss of prestress in the steel strands, keeping the overall prestress not too low or even increasing.
The longitudinal steel bars in the concrete beam are welded on the steel bars, the waist bars are welded on the stirrups, and the stirrups and the steel bars are welded on the base plate.
Compared with the prior art, the design method of the recoverable assembly type concrete node can reduce earthquake damage and resist earthquake secondary fire, so that the structure has good self-recovery capability during earthquake and good fire resistance under the earthquake secondary fire, and the loss of lives and properties is reduced to a certain extent.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a comparison of the limit strength of the SMA steel bar and the conventional prestressed steel bar at a high temperature.
In the figure, 1-concrete beam, 2-steel strand, 3-prestress SMA bar, 4-angle steel and 5-bolt.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Examples
The utility model provides a fire-resistant assembled concrete node of prestressing force of antidetonation, its structure is shown in figure 1, comprises concrete beam 1 and the concrete column of pre-buried steel sheet, and concrete beam 1 passes through the backing plate to be connected with the backing plate on the concrete column, and concrete beam 1 has two, and the intercrossing overlap joint is on the bracket of concrete column, and then improves the bulk rigidity of structure.
The hole is reserved in the middle of the concrete beam 1, the prestressed tendons penetrate through the hole, the prestressed tendons used in the embodiment are composed of steel strands 2 and prestressed SMA tendons 3, the steel strands 2 and the prestressed SMA tendons 3 work in a cooperative mode at a low temperature, and the shape memory effect of the SMA tendons is excited at a high temperature to enable the SMA tendons to generate reverse martensite phase transformation and generate pretightening force, so that the prestress loss of the steel strands is compensated. The prestressed tendons are provided with anchorage devices at the joints far away from the concrete beams and the concrete columns for anchoring. The longitudinal steel bars in the concrete beam are welded on the steel bars, the waist bars are welded on the stirrups, and the stirrups and the steel bars are welded on the base plate.
The junction of concrete beam 1 and concrete column still is equipped with angle steel 4, and angle steel 4 passes through bolt 5 and is connected with concrete beam 1 and concrete column. The semi-rigid node of the angle steel is arranged at the node of the concrete beam and the column so as to appropriately loose the restraint between the beam and the column, thereby allowing the rotation of the frame beam. In the node allowing the frame beam to rotate, the structure can freely swing under the action of earthquake, and the beam and the column member participate in energy consumption. In addition, the steel plates can prevent the concrete from being locally damaged during collision and facilitate the construction of bolt connection. On the basis of arranging the angle steel, the self-resetting of the structure can be realized by arranging the non-cohesive steel-SMA combined prestressed tendon in the beam. SMA has a unique shape memory effect, and SMA transforms from the martensite phase to the austenite phase at high temperatures and reverts to the original form. If the traditional prestressed steel strand is combined with the SMA bar, the two ends of the traditional prestressed steel strand are prestressed. At high temperatures the SMA will develop considerable restoring forces which counteract the loss of prestress in the steel strands, keeping the overall prestress not too low or even increasing.
Fig. 2 is a comparison of the limit strength of the SMA tendon and the conventional prestressed tendon at high temperature, and it can be seen from the analysis and comparison shown in fig. 2 that the prestressed tendon not only has significantly better stress performance at normal temperature than the conventional steel strand, but also has better stress performance at normal temperature than the conventional steel strand before the temperature reaches 400 ℃. Therefore, the novel steel strand provided by the invention not only does not generate prestress loss in the whole fire process, but also can basically ensure that the novel steel strand has better mechanical property than that of the novel steel strand at normal temperature, thereby offsetting the structural deformation generated by the high-temperature creep of concrete and slowing down the cracking of the concrete and the high-temperature diffusion of the fire.
The manufacturing process flow of the invention is as follows: (1) and designing a mould of the concrete beam and the concrete column, and cutting and processing a steel plate and angle steel. (2) Binding reinforcing steel bars, welding steel bars, pouring concrete beams and columns, and embedding bolts and steel plates in advance. (3) And mounting prestressed steel strands and prestressed SMA (shape memory alloy) bars. (4) And tensioning the prestressed steel strands and the SMA bars, and anchoring by using an anchorage device.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (5)
1. An earthquake-resistant and fire-resistant prestressed fabricated concrete node is characterized in that the concrete node consists of a concrete beam with a pre-embedded steel plate and a concrete column,
the concrete beam is connected with the backing plate on the concrete column through the backing plate,
a hole is reserved in the middle of the concrete beam, a prestressed tendon penetrates through the hole, the prestressed tendon consists of a steel strand and a prestressed shape memory alloy tendon, the prestressed shape memory alloy tendon is a prestressed SMA tendon, the steel strand and the prestressed SMA tendon work in a cooperative mode at a low temperature, and the shape memory effect of the SMA tendon is excited at a high temperature to generate reverse martensite phase change and generate pretightening force so as to compensate for the prestress loss of the steel strand;
the concrete beam and concrete column junction still is equipped with the angle steel, the angle steel passes through the bolt and is connected with concrete beam and concrete column, through set up angle steel semi-rigid node in concrete beam, post node, relaxs restraint between the beam column, allows the rotation of frame roof beam, and in this kind of node that allows frame roof beam pivoted, the structure freely takes place to sway under the earthquake action, and beam, post component participate in the power consumption.
2. An earthquake-resistant and fire-resistant pre-stressed fabricated concrete joint according to claim 1, wherein the pre-stressed tendons are anchored by arranging anchors at the joints far away from the concrete beams and the concrete columns.
3. An earthquake-resistant and fire-resistant prestressed fabricated concrete joint as claimed in claim 1, wherein said concrete beams are two in number and cross-lapped on the corbels of said concrete columns.
4. An earthquake-resistant and fire-resistant pre-stressed assembled concrete joint according to claim 1, wherein the longitudinal reinforcing bars in the concrete beam are welded to the steel bars, and the wale is welded to the stirrup.
5. An earthquake-resistant and fire-resistant pre-stressed fabricated concrete joint according to claim 4, wherein said stirrups and said steel bars are welded to said backing plate.
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CN108824636B true CN108824636B (en) | 2020-10-02 |
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Citations (3)
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CN205134616U (en) * | 2015-11-21 | 2016-04-06 | 山东科技大学 | Foamed aluminium - steel sheet viscous damping wall can reset |
CN106368382A (en) * | 2016-10-19 | 2017-02-01 | 沈阳建筑大学 | Manufacturing method for fire-resisting self-repairing beam component based on shape memory alloy |
CN107407100A (en) * | 2014-12-18 | 2017-11-28 | Re-Fer股份公司 | Prestressed structure and the method for structure member are produced by SMA tension elements, and are equipped with the structure and structure member of SMA tension elements |
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Publication number | Priority date | Publication date | Assignee | Title |
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CA2677741C (en) * | 2007-05-16 | 2012-09-04 | Thyssen Elevator Capital Corp. | Actively damped tension member |
CN101798849B (en) * | 2010-03-26 | 2011-07-20 | 东南大学 | Node connection device for self-centering prestressed concrete frame |
CN103132602A (en) * | 2013-02-27 | 2013-06-05 | 同济大学 | Self-resetting frame joint |
CN205875395U (en) * | 2016-08-02 | 2017-01-11 | 北京市建筑工程研究院有限责任公司 | Prestressing force is from restoring to throne assembled concrete frame beam column node |
CN107035203A (en) * | 2017-06-07 | 2017-08-11 | 沈阳建筑大学 | A kind of SMA energy consumers prestressing without bondn system |
CN107975159B (en) * | 2017-12-01 | 2023-11-24 | 山东大学 | Assembled self-resetting energy consumption supporting device and building |
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN107407100A (en) * | 2014-12-18 | 2017-11-28 | Re-Fer股份公司 | Prestressed structure and the method for structure member are produced by SMA tension elements, and are equipped with the structure and structure member of SMA tension elements |
CN205134616U (en) * | 2015-11-21 | 2016-04-06 | 山东科技大学 | Foamed aluminium - steel sheet viscous damping wall can reset |
CN106368382A (en) * | 2016-10-19 | 2017-02-01 | 沈阳建筑大学 | Manufacturing method for fire-resisting self-repairing beam component based on shape memory alloy |
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